package net.ipipip0129.yukicoder.no627;

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int cnt = Integer.parseInt(scan.nextLine());
		
		int revnum = 0;
		boolean isend = false;
		for (int i = 0; i < cnt; i++) {
			int num = Integer.parseInt(scan.nextLine());
			if ((revnum - num) * (revnum - num) != 1) {
				System.out.println("F");
				isend = true;
				break;
			}
			revnum = num;
		}
		
		scan.close();
		
		if(!isend) {
			System.out.println("T");
		}
		
	}
}